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Inventory - Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 1,796 $ 2,055
Work-in-process 4,843 7,311
Finished goods 4,087 1,743
Total inventory $ 10,726 $ 11,109